Oxygen-enriched gas test system with impurity addition function and impurity addition method

Abstract

This invention relates to a simulated liquid rocket engine testing system and method, specifically an oxygen-enriched gas testing system and method with impurity addition functionality. It addresses the technical problem of difficulty in studying the temperature resistance of turbine materials under impurity scouring conditions during simulated high-temperature, high-pressure, and high-flow-rate oxygen-enriched gas operation, leading to high engine development risks and costs. The oxygen-enriched gas testing system with impurity addition functionality includes a liquid oxygen supply module, a fuel supply module, and an oxygen-enriched gas combustion device. The liquid oxygen supply module supplies oxidizer to the oxygen-enriched gas combustion device; the fuel supply module supplies fuel to the oxygen-enriched gas combustion device; and the impurity supply unit inputs the impurities to be added into the oxygen-enriched gas combustion device through a liquid oxygen main pipeline. The impurity addition method of this invention allows for precise control of the rate at which the impurities enter the oxygen-enriched gas combustion device, thus completing the testing of the temperature resistance of the turbine materials to be evaluated.

Description

TECHNICAL FIELD

[0001] The present application relates to a simulation liquid rocket engine test system and method, in particular to an oxygen-enriched gas test system with impurity adding function and an impurity adding method. BACKGROUND

[0002] For liquid rocket engines using liquid oxygen kerosene as propellant, in order to obtain higher specific impulse performance of the engine, while avoiding carbon deposition in engine turbine and gas duct components, the engine system scheme usually selects a high-pressure oxygen-enriched supplementary combustion cycle system. During the operation of this type of engine, the oxygen-enriched gas generated by the gas generator combustion first drives the turbine to work, and then enters the thrust chamber through the gas duct, and then burns with kerosene.

[0003] In order to further improve the performance of the existing high-pressure oxygen-enriched supplementary combustion cycle liquid oxygen kerosene engine, it is necessary to try to increase the working temperature of the oxygen-enriched gas generator. The oxygen-enriched gas temperature of the oxygen-enriched supplementary combustion cycle liquid oxygen kerosene engine being developed is close to the ignition temperature of the downstream turbine material. However, during the operation of the engine, a small amount of impurities will exist in the tank. The small impurities smaller than the pore size of the engine inlet filter will enter the engine with the propellant. According to relevant research, impurities in the oxygen-enriched gas environment will cause the ignition temperature of the turbine material to drop significantly, which poses a risk of ablation of the engine. Therefore, in order to ensure the reliability of the engine operation, it is necessary to accurately obtain the specific influence of impurities on the ignition temperature of the turbine material.

[0004] The influence of impurities on the ignition temperature of the turbine material is greatly related to the gas pressure, temperature, flow rate, etc. In order to accurately obtain the relevant data, it is necessary to carry out related research in the environment of the real working parameters of the engine. Since the cost of engine test is very high, it is usually not used to carry out material performance related test. Therefore, in order to reduce the risk and cost of engine development, it is necessary to carry out research on the influence of impurities on the temperature resistance performance of the turbine material in the oxygen-enriched gas environment before the engine test.

[0005] In the prior art, there is no report on the related technical problem of studying the temperature resistance performance of the turbine material under the condition of impurity flushing in the simulation of the real high-temperature, high-pressure and high-flow-rate oxygen-enriched gas working environment of the engine. SUMMARY

[0006] The purpose of the present application is to solve the technical problem that it is difficult to study the temperature resistance performance of the turbine material under the condition of impurity flushing in the simulation of the real high-temperature, high-pressure and high-flow-rate oxygen-enriched gas working environment of the engine, resulting in high risk and cost of engine development, and to provide an oxygen-enriched gas test system with impurity adding function and a method.

[0007] To solve the above technical problems, the technical scheme adopted by the present application is:

[0008] The oxygen-enriched fuel gas test system with impurity adding function comprises a liquid oxygen supply module and a fuel supply module, and is characterized in that the system further comprises an oxygen-enriched fuel gas combustion device.

[0009] The liquid oxygen supply module is connected with the oxygen-enriched fuel gas combustion device, and is used for supplying an oxidant for the oxygen-enriched fuel gas combustion device.

[0010] The fuel supply module is connected with the oxygen-enriched fuel gas combustion device, and is used for supplying fuel for the oxygen-enriched fuel gas combustion device.

[0011] The liquid oxygen supply module comprises a liquid oxygen input pipeline, a liquid oxygen main pipeline, an impurity supply unit and a pre-cooling backflow unit.

[0012] One end of the liquid oxygen input pipeline is connected with an input port of the liquid oxygen main pipeline through a liquid oxygen main valve, and the other end of the liquid oxygen input pipeline is connected with an external liquid oxygen source.

[0013] An output port of the liquid oxygen main pipeline is connected with the oxygen-enriched fuel gas combustion device.

[0014] The impurity supply unit comprises a bypass liquid oxygen pipeline and an impurity storage pipeline, and the impurity storage pipeline is filled with impurities to be added; an inlet end of the bypass liquid oxygen pipeline is connected with one end of the liquid oxygen input pipeline, an outlet end of the bypass liquid oxygen pipeline is connected with one end of the impurity storage pipeline through a bypass oxygen valve, the other end of the impurity storage pipeline is connected with the liquid oxygen main pipeline, and the pressure at the inlet end of the bypass liquid oxygen pipeline is higher than the pressure at the outlet end of the impurity supply unit, so as to form a pressure difference between the inlet end and the outlet end of the bypass liquid oxygen pipeline, and make the liquid oxygen carry the impurities to be added in the impurity storage pipeline into the liquid oxygen main pipeline, and then into the oxygen-enriched fuel gas combustion device.

[0015] The pre-cooling backflow unit is used for pre-cooling the liquid oxygen input pipeline and the bypass liquid oxygen pipeline.

[0016] Further, a bypass pipeline throttling device is arranged on the bypass liquid oxygen pipeline.

[0017] A main pipeline throttling device is arranged on the liquid oxygen main pipeline, and is located above the position where the other end of the impurity storage pipeline is connected with the liquid oxygen main pipeline, and is located below the position where one end of the liquid oxygen input pipeline is connected with the liquid oxygen main pipeline. The main pipeline throttling device can ensure that there is a certain pressure difference between the inlet end and the outlet end of the bypass liquid oxygen pipeline.

[0018] Further, a bypass filter is arranged between the bypass oxygen valve and the impurity storage pipeline. The bypass filter mainly prevents the impurities to be added from flowing back into the bypass oxygen valve under the high pressure of the liquid oxygen main pipeline before the bypass oxygen valve is opened, and prevents the structure of the bypass oxygen valve from being damaged, and prevents the impurities from being smoothly discharged during work.

[0019] Further, the precooling return unit comprises a precooling discharge pipe;

[0020] The precooling discharge pipe comprises a first precooling pipe and a second precooling pipe connected with the first precooling pipe through a precooling discharge valve.

[0021] One end of the precooling discharge pipe is connected with one end of a liquid oxygen input pipe and a liquid oxygen main pipe through a liquid oxygen main valve, and the other end of the precooling discharge pipe is connected with one end of a bypass liquid oxygen pipe through a bypass oxygen valve.

[0022] Further, the impurity storage pipe is in a semicircular arc structure, so that when the liquid oxygen main valve is opened before the bypass oxygen valve is opened, the high flow rate and low pressure in the liquid oxygen main pipe can prevent the liquid oxygen in the liquid oxygen main pipe from being sucked into the impurity storage pipe, thereby preventing the impurities from being added into the liquid oxygen main pipe.

[0023] The fuel supply module is connected with the oxygen-enriched gas combustion device through a fuel valve.

[0024] Meanwhile, the application also provides an impurity adding method based on the oxygen-enriched gas test system with the impurity adding function, and the method comprises the following steps:

[0025] 1) Before the test, the liquid oxygen input pipe and the bypass liquid oxygen pipe are pre-cooled.

[0026] 2) The liquid oxygen main valve is opened to ensure the normal flow of the liquid oxygen in the liquid oxygen main pipe, and the fuel supply module provides fuel for the oxygen-enriched gas combustion device to make the oxygen-enriched gas combustion device work normally.

[0027] 3) After the combustion state of the oxygen-enriched gas combustion device in the test is stable, the bypass oxygen valve is opened, the liquid oxygen in the bypass liquid oxygen pipe carries the impurities in the impurity storage pipe into the oxygen-enriched gas combustion device to realize the erosion of the turbine material test piece in the oxygen-enriched gas environment.

[0028] Further, step 3) is specifically as follows:

[0029] After the combustion state of the oxygen-enriched gas combustion device in the test is stable, the bypass oxygen valve is opened, the liquid oxygen in the bypass liquid oxygen pipe carries the impurities in the impurity storage pipe into the oxygen-enriched gas combustion device, the main throttle device on the liquid oxygen main pipe and the bypass throttle device on the bypass liquid oxygen pipe are adjusted to control the rate of the impurities entering the oxygen-enriched gas combustion device, and the erosion of the turbine material test piece in the oxygen-enriched gas environment is realized.

[0030] Further, the specific method for controlling the rate of the impurities to be added into the oxygen-enriched gas combustion device by adjusting the main path throttling device on the liquid oxygen main path and the bypass path throttling device on the bypass liquid oxygen path in step 3) is:

[0031] A. Calculate the rate v4 of the impurities to be added into the oxygen-enriched gas combustion device in the impurity storage tube by the following formula:

[0032]

[0033] (μA) 3 is the effective flow area of the main path throttling device;

[0034] (μA) 7 is the effective flow area of the bypass path throttling device;

[0035] q m is the total flow rate of the oxidant in the test;

[0036] ρ is the density of the oxidant in the test;

[0037] A4 is the flow area of the impurity storage tube;

[0038] B. According to the rate v4 in step A, adjust the effective flow area of the main path throttling device on the liquid oxygen main path and the bypass path throttling device on the bypass liquid oxygen path to realize the erosion of the turbine material test piece in the oxygen-enriched gas environment.

[0039] Further, it further comprises step 4):

[0040] First, close the bypass oxygen valve, and then close the liquid oxygen main valve at the end of the test.

[0041] Before step 1), it further comprises step 0):

[0042] The impurities to be added are deposited in the impurity storage tube, and one end of the impurity storage tube is connected with the liquid oxygen main path, and the other end is connected with the bypass oxygen valve through a bypass filter.

[0043] Compared with the prior art, the beneficial effects of the technical scheme of the present application are:

[0044] (1) The oxygen-enriched gas test system with impurity adding function of the present application can well simulate the working environment of the engine in the real high-temperature, high-pressure and high-flow-rate oxygen-enriched gas, and complete the test of the temperature resistance of the turbine material to be tested in the oxygen-enriched gas combustion device under the condition of oxygen-enriched gas environment and impurity erosion, thereby avoiding the problems of engine development risk and high cost.

[0045] (2) The oxygen-enriched gas test system with impurity adding function of the present application is realized through the cooperation of the bypass liquid oxygen pipeline, the bypass pipeline throttling device, the bypass oxygen valve, the bypass filter and the impurity storage pipeline. The inlet end of the bypass liquid oxygen pipeline is located before the inlet of the liquid oxygen main valve, and the outlet end is located after the main pipeline throttling device, so as to ensure that the inlet end and the outlet end of the bypass liquid oxygen pipeline have a certain pressure difference. When the bypass oxygen valve is opened, the liquid oxygen in the bypass liquid oxygen pipeline will quickly carry the impurities to be added into the liquid oxygen main pipeline.

[0046] (3) The impurity storage pipeline in the system of the present application is designed as a semicircular arc structure. The impurities to be added are deposited at the bottom of the impurity storage pipeline before connection, and the main purpose is to prevent the liquid oxygen (oxygen vapor at this time) in the liquid oxygen main pipeline from flowing and generating suction on the impurity storage pipeline in the instant when the liquid oxygen main valve is opened before the bypass oxygen valve is opened, so as to avoid that the impurities to be added are brought into the liquid oxygen main pipeline in advance, and the reliability of the system is improved.

[0047] (4) In the impurity adding method of the present application, the flow resistance of the main pipeline throttling device on the liquid oxygen main pipeline and the bypass pipeline throttling device on the bypass liquid oxygen pipeline can be flexibly adjusted according to the working condition to adjust the speed of the impurities to be added into the liquid oxygen main pipeline, so as to realize precise control of the rate of the impurities to be added into the oxygen-enriched gas combustion device.

[0048] (5) The impurity adding method of the present application can complete the test working condition parameter calculation through feasibility and risk analysis. The method fully utilizes the existing oxygen-enriched gas combustion device, and only needs to make corresponding improvements in the liquid oxygen main pipeline to achieve the purpose of adding impurities. The method of the present application can be applied to subsequent other types of test systems which need to add impurities into the combustion device, so as to realize the evaluation test under the impurity scouring condition. BRIEF DESCRIPTION OF DRAWINGS

[0049] Figure 1 FIG. 1 is a structural schematic diagram of the existing oxygen-enriched gas test system.

[0050] Figure 1 The reference signs are as follows:

[0051] 01-liquid oxygen input pipeline, 02-liquid oxygen main valve, 03-main pipeline throttling device, 04-liquid oxygen main pipeline, 05-precooling discharge valve, 06-precooling discharge pipeline, 07-fuel valve, 08-oxygen-enriched gas combustion device.

[0052] Figure 2 FIG. 2 is a structural schematic diagram of the embodiment of the oxygen-enriched gas test system with impurity adding function of the present application, wherein ① represents the oxidant supply inlet, ② represents the fuel supply inlet, and ③ represents the precooling discharge outlet.

[0053] Figure 2Reference signs are:

[0054] 1 - liquid oxygen main pipe, 2 - liquid oxygen main valve, 3 - main pipe throttling device, 4 - impurity storage pipe, 5 - bypass filter, 6 - bypass oxygen valve, 7 - bypass pipe throttling device, 8 - bypass liquid oxygen pipe, 9 - pre-cooling discharge valve, 10 - fuel valve, 11 - oxygen-enriched gas combustion device, 13 - liquid oxygen input pipe, 14 - pre-cooling discharge pipe, 141 - first pre-cooling pipe, 142 - second pre-cooling pipe. DETAILED DESCRIPTION

[0055] The technical solutions of the present application will be described clearly and completely below in combination with the drawings. Obviously, the described embodiments are part of the embodiments of the technical solutions of the present application, rather than all the embodiments. Based on the technical solutions in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0056] As shown in Figure 1 , the existing oxidant supply system, fuel supply system and oxygen-enriched gas combustion device 08, wherein the oxidant supply system is connected with the liquid oxygen main pipe 04 of the oxygen-enriched gas combustion device 08 through the liquid oxygen input pipe 01 and the liquid oxygen main valve 02, the main pipe throttling device 03 is arranged on the liquid oxygen main pipe 04, the liquid oxygen main pipe 04 is connected with the pre-cooling discharge pipe 06 through the pre-cooling discharge valve 05, and the oxygen-enriched gas combustion device 08 is connected with the fuel supply system through the fuel valve 07. When pre-cooling is needed, liquid oxygen is input into the liquid oxygen input pipe 01, and the pre-cooling discharge valve 05 is opened.

[0057] The working principle of the oxygen-enriched gas combustion device 08 is that the oxidant and fuel are continuously supplied to the oxygen-enriched gas combustion device 08 at a certain pressure through the oxidant inlet and the fuel inlet, and the oxygen-enriched gas is generated by combustion in the interior, which is used for testing the temperature resistance of the turbine material under the conditions of oxygen-enriched gas environment and metal impurity scouring.

[0058] As shown in Figure 2 , the present application comprises a liquid oxygen supply module, a fuel supply module and an oxygen-enriched gas combustion device 11.

[0059] The liquid oxygen supply module is connected with the oxygen-enriched fuel gas combustion device 11, and is used for supplying the oxidant to the oxygen-enriched fuel gas combustion device 11 through the oxidant supply inlet; the fuel supply module is connected with the oxygen-enriched fuel gas combustion device 11, and is used for supplying the fuel to the oxygen-enriched fuel gas combustion device 11 through the fuel supply inlet; the liquid oxygen supply module comprises a liquid oxygen input pipeline 13, a liquid oxygen main pipeline 1, an impurity supply unit and a precooling backflow unit; one end of the liquid oxygen input pipeline 13 is connected with the input port of the liquid oxygen main pipeline 1 through a liquid oxygen main valve 2, and the other end of the liquid oxygen input pipeline 13 is connected with an external liquid oxygen source; the output port of the liquid oxygen main pipeline 1 is connected with the oxygen-enriched fuel gas combustion device 11, and is used for supplying the oxidant to the oxygen-enriched fuel gas combustion device 11 according to requirements;

[0060] The impurity supply unit comprises a bypass liquid oxygen pipeline 8 and an impurity storage pipeline 4; the impurity storage pipeline 4 is filled with the impurities to be added; one end of the bypass liquid oxygen pipeline 8 is connected with one end of the liquid oxygen input pipeline 13, and the other end of the bypass liquid oxygen pipeline 8 is connected with the other end of the impurity storage pipeline 4 through a bypass oxygen valve 6; the other end of the impurity storage pipeline 4 is connected with the liquid oxygen main pipeline 1, and the pressure at the inlet end of the bypass liquid oxygen pipeline 8 is higher than the pressure at the outlet end of the impurity supply unit; when the liquid oxygen is input into the impurity supply unit, the bypass throttling device 7 generates a large pressure difference, so that the pressure difference is formed between the inlet end and the outlet end of the bypass liquid oxygen pipeline 8, and then the liquid oxygen carries the impurities to be added in the impurity storage pipeline 4 into the liquid oxygen main pipeline 1, and further into the oxygen-enriched fuel gas combustion device 11 through the liquid oxygen main pipeline 1 at a small flow rate; the precooling backflow unit is used for precooling the liquid oxygen input pipeline 13 and the bypass liquid oxygen pipeline 8.

[0061] In the embodiment, the bypass throttling device 7 is arranged on the bypass liquid oxygen pipeline 8; the main throttling device 3 is arranged on the liquid oxygen main pipeline 1, and is located above the position where the other end of the impurity storage pipeline 4 is connected with the liquid oxygen main pipeline 1, and is located below the position where one end of the liquid oxygen input pipeline 13 is connected with the liquid oxygen main pipeline 1.

[0062] In addition, the bypass filter 5 is arranged between the bypass oxygen valve 6 and the impurity storage pipeline 4. The precooling backflow unit comprises a precooling discharge pipeline 14, which comprises a first precooling pipeline 141 and a second precooling pipeline 142 connected with the first precooling pipeline 141 through a precooling discharge valve 9; one end of the precooling discharge pipeline 141 is connected with one end of the liquid oxygen input pipeline 13 and the liquid oxygen main pipeline 1 through the liquid oxygen main valve 2, and one end of the precooling discharge pipeline 142 is connected with the other end of the bypass liquid oxygen pipeline 8 through the bypass oxygen valve 6. The impurity storage pipeline 4 has a semicircular arc structure; the fuel supply module is connected with the oxygen-enriched fuel gas combustion device 11 through a fuel valve 10.

[0063] The working process of the oxygen-enriched fuel gas test system with the impurity adding function is as follows:

[0064] The impurity supply unit is arranged on the basis of the liquid oxygen main pipeline 1. The impurity supply unit is matched by the bypass liquid oxygen pipeline 8, the bypass pipeline throttling device 7, the bypass oxygen valve 6, the bypass filter 5 and the impurity storage pipeline 4. The inlet end of the bypass liquid oxygen pipeline 8 is located in front of the inlet of the liquid oxygen main valve 2, and the outlet end is located behind the main pipeline throttling device 3, so that the inlet end and the outlet end of the bypass liquid oxygen pipeline 8 have a certain pressure difference.

[0065] After the bypass oxygen valve 6 is opened, the liquid oxygen in the bypass liquid oxygen pipeline 8 will quickly carry the impurities to be added into the liquid oxygen main pipeline 1. In the embodiment, the impurity storage pipeline 4 is designed as a semicircular arc structure, and the impurities to be added are deposited at the bottom of the impurity storage pipeline 4 before installation. The main purpose is to prevent the oxygen vapor flow in the liquid oxygen main pipeline 1 from generating a certain suction effect on the impurity storage pipeline 4 in the instant when the liquid oxygen main valve 2 is opened before the bypass oxygen valve 6 is opened, so that the impurities to be added are brought into the liquid oxygen main pipeline 1 in advance.

[0066] The bypass filter 5 mainly prevents the impurities to be added from flowing back into the bypass oxygen valve 6 under the high pressure of the liquid oxygen main pipeline 1 before the bypass oxygen valve 6 is opened, which is not conducive to the smooth discharge of the impurities during work and causes damage to the structure of the bypass oxygen valve 6.

[0067] The bypass pipeline throttling device 7 is mainly used for adjusting the flow of liquid oxygen in the bypass liquid oxygen pipeline 8, so as to realize the adjustment of the entering speed of the impurities to be added according to the working condition.

[0068] The design concept of the impurity adding method is:

[0069] (1) The idea of the impurity adding method is to arrange the bypass liquid oxygen pipeline 8 on the basis of the liquid oxygen main pipeline 1, form a certain pressure difference between the inlet end and the outlet end of the bypass liquid oxygen pipeline 8, and ensure that the liquid oxygen in the bypass liquid oxygen pipeline 8 will quickly carry the impurities to be added into the liquid oxygen main pipeline 1. During the test, the liquid oxygen main valve 2 is first opened to ensure the normal work of the oxygen-rich gas combustion device 11, and then the bypass oxygen valve 6 is opened after the combustion state of the oxygen-rich gas combustion device 11 is stable, so that the impurities to be added are carried into the oxygen-rich gas, and the test of the turbine material test piece is started.

[0070] (2) The control method of the entering rate of the impurities to be added into the liquid oxygen main pipeline 1 in the impurity adding method is to adjust the flow resistance characteristics (the flow resistance characteristics are the inherent characteristics of a certain fixed structure, which reflect how much pressure loss is generated after the fluid flows through it) of the main pipeline throttling device 3 on the liquid oxygen main pipeline 1 and the bypass pipeline throttling device 7 on the bypass liquid oxygen pipeline 8, so as to accurately control the rate of the impurities entering the oxygen-rich gas combustion device 11.

[0071] The application provides a kind of impurity adding method, based on the above-mentioned oxygen-rich gas test system with impurity adding function, comprising the following steps:

[0072] 0) the impurity to be added is loaded into the impurity storage tube 4, and one end of the impurity storage tube 4 is connected with the liquid oxygen main pipeline 1, and the other end is connected with the bypass oxygen valve 6 through the bypass filter 5.

[0073] 1) Before the test, open all the valves, use the overflow pre-cooling method, and use liquid oxygen to pre-cool the liquid oxygen input pipeline 13 and the bypass liquid oxygen pipeline 8; ensure that the pipeline before the liquid oxygen main valve 2 and the bypass oxygen valve 6 is fully pre-cooled away from the oxygen-rich gas combustion device 11;

[0074] 2) Open the liquid oxygen main valve 2 to ensure that the liquid oxygen in the liquid oxygen main pipeline 1 flows normally, and provide fuel for the oxygen-rich gas combustion device 11 through the fuel supply module, so that the oxygen-rich gas combustion device 11 works normally;

[0075] 3) When the oxygen-rich gas combustion device 11 works, it needs to be ignited first, and the ignition process usually takes less than 1s, and generally enters a stable working state soon after ignition; after the combustion state of the oxygen-rich gas combustion device 11 in the test is stable, open the bypass oxygen valve 6, and the liquid oxygen in the bypass liquid oxygen pipeline 8 carries the impurities to be added in the impurity storage tube 4 into the oxygen-rich gas combustion device 11; by adjusting the main pipeline throttling device 3 on the liquid oxygen main pipeline 1 and the bypass pipeline throttling device 7 on the bypass liquid oxygen pipeline 8, the rate of the impurities to be added into the oxygen-rich gas combustion device 11 is controlled, and the impurities to be added into the oxygen-rich gas combustion device 11 are controlled.

[0076] In step 3), the specific method for adjusting the main pipeline throttling device 3 on the liquid oxygen main pipeline 1 and the bypass pipeline throttling device 7 on the bypass liquid oxygen pipeline 8 to control the rate of the impurities to be added into the oxygen-rich gas combustion device 11 is as follows:

[0077] A, calculate the liquid oxygen flow rate in the impurity storage tube 4 by the following formula to approximately simulate the rate v4 of the impurities to be added into the oxygen-rich gas combustion device 11:

[0078]

[0079] In the formula, (μA)3 is the effective flow area of the main pipeline throttling device 3;

[0080] (μA)7 is the effective flow area of the bypass pipeline throttling device 7;

[0081] q m is the total flow rate of the oxidant in the test;

[0082] ρ is the density of the oxidant in the test;

[0083] A4 is the flow area of the impurity storage tube 4;

[0084] B. According to the rate v4 in step A, adjust the effective flow areas of the main path throttling device 3 on the liquid oxygen main path 1 and the bypass path throttling device 7 on the bypass liquid oxygen path 8 to control the rate of the impurities to be added into the oxygen-enriched gas combustion device 11, and realize the erosion of the turbine material test piece in the oxygen-enriched gas environment.

[0085] Step 4) Close the bypass oxygen valve 6 first, and then close the liquid oxygen main valve 2 at the end of the test.

[0086] In this embodiment, 1) since the total amount of impurities in the impurity storage tube 4 is very small (less than 1g), and the liquid oxygen flow in the liquid oxygen main path 1 is relatively large (about 100g / s), it is assumed that the flow rate of the liquid oxygen in the liquid oxygen main path 1 can approximately represent the entering speed of the impurities to be added; 2) since the pressure drops between the main path throttling device 3 and the bypass path throttling device 7 are both much larger than the pressure drops of the respective pipelines and valves, it is assumed that the pressure drop of the main path throttling device 3 is the pressure drop of the entire liquid oxygen main path 1, and the pressure drop of the bypass path throttling device 7 is the pressure drop of the impurity supply unit.

[0087] On the basis of the above conditions, the ratio of the effective flow areas of the main path throttling device 3 and the bypass path throttling device 7 can be obtained, as shown in the following expression:

[0088]

[0089] In the formula, (μA)3 is the effective flow area of the main path throttling device 3;

[0090] (μA)7 is the effective flow area of the bypass path throttling device 7;

[0091] q m is the total flow rate of the oxidant in the test;

[0092] ρ is the density of the oxidant in the test;

[0093] A4 is the flow area of the impurity storage tube 4;

[0094] The rate v4 of the impurities to be added into the oxygen-enriched gas combustion device 11 is calculated by the above formula:

[0095] In this embodiment, first, according to the test working condition requirements, the following parameters are determined:

[0096] 1) the target value of the speed of the impurities to be added into the oxygen-enriched gas combustion device 11, i.e. the flow rate v4 of the fluid in the impurity storage tube 4,

[0097] 2) the total flow rate q of the oxidant m ;

[0098] 3) According to the test conditions, the density of the oxidant ρ is calculated; then, combined with the known flow area A4 of the impurity storage tube 4, the above formula is substituted to calculate the effective flow area ratio of the main path throttling device 3 and the bypass path throttling device 7. According to the ratio, the appropriate two throttling devices are selected, so that the rate of the impurity to be added into the generator of the oxygen-enriched gas combustion device 11 can be accurately controlled.

Claims

1. An oxygen-enriched fuel gas test system with impurity adding function, comprising a liquid oxygen supply module and a fuel supply module; characterized in that Further comprising an oxygen-enriched fuel gas combustion device (11); The liquid oxygen supply module is connected with the oxygen-enriched fuel gas combustion device (11), and the liquid oxygen supply module is used for supplying oxidant for the oxygen-enriched fuel gas combustion device (11); The fuel supply module is connected with the oxygen-enriched fuel gas combustion device (11), and the fuel supply module is used for supplying fuel for the oxygen-enriched fuel gas combustion device (11); The liquid oxygen supply module comprises a liquid oxygen input pipeline (13), a liquid oxygen main pipeline (1), an impurity supply unit and a pre-cooling backflow unit; One end of the liquid oxygen input pipeline (13) is connected with the input port of the liquid oxygen main pipeline (1) through a liquid oxygen main valve (2), and the other end of the liquid oxygen input pipeline (13) is connected with an external liquid oxygen source; The output port of the liquid oxygen main pipeline (1) is connected with the oxygen-enriched fuel gas combustion device (11); The impurity supply unit comprises a bypass liquid oxygen pipeline (8) and an impurity storage tube (4); the impurity storage tube (4) is deposited with impurities to be added; one end of the bypass liquid oxygen pipeline (8) is connected with one end of the liquid oxygen input pipeline (13); the outlet end of the bypass liquid oxygen pipeline (8) is connected with one end of the impurity storage tube (4) through a bypass oxygen valve (6); the other end of the impurity storage tube (4) is connected with the liquid oxygen main pipeline (1); the pressure at the inlet end of the bypass liquid oxygen pipeline (8) is higher than the pressure at the outlet end of the impurity supply unit, so that a pressure difference is formed between the inlet end and the outlet end of the bypass liquid oxygen pipeline (8), so that the liquid oxygen carries the impurities to be added in the impurity storage tube (4) into the liquid oxygen main pipeline (1), and then into the oxygen-enriched fuel gas combustion device (11); The pre-cooling backflow unit is used for pre-cooling the liquid oxygen input pipeline (13) and the bypass liquid oxygen pipeline (8).

2. The oxygen-enriched fuel gas test system with impurity addition function according to claim 1, characterized in that: A bypass pipeline throttling device (7) is arranged on the bypass liquid oxygen pipeline (8); A main pipeline throttling device (3) is arranged on the liquid oxygen main pipeline (1), and the main pipeline throttling device (3) is located above the position where the other end of the impurity storage tube (4) is connected with the liquid oxygen main pipeline (1), and below the position where one end of the liquid oxygen input pipeline (13) is connected with the liquid oxygen main pipeline (1).

3. The oxygen-enriched fuel gas test system with impurity adding function according to claim 2, characterized in that: A bypass filter (5) is arranged between the bypass oxygen valve (6) and the impurity storage tube (4).

4. The oxygen-enriched fuel gas test system with impurity adding function according to claim 3, characterized in that: The pre-cooling backflow unit comprises a pre-cooling discharge pipeline (14); The pre-cooling discharge pipeline (14) comprises a first pre-cooling pipeline (141) and a second pre-cooling pipeline (142) connected with the first pre-cooling pipeline (141) through a pre-cooling discharge valve (9); One end of the first pre-cooling pipeline (141) is connected with one end of the liquid oxygen input pipeline (13) and the liquid oxygen main pipeline (1) through the liquid oxygen main valve (2), respectively; one end of the second pre-cooling pipeline (142) is connected with the other end of the bypass liquid oxygen pipeline (8) through the bypass oxygen valve (6).

5. The oxygen-enriched fuel gas test system with impurity addition function according to claim 4, characterized in that: The impurity storage tube (4) has a semi-circular arc structure; The fuel supply module is connected with the oxygen-enriched fuel gas combustion device (11) through a fuel valve (10).

6. A method for adding impurities, based on the oxygen-enriched gas test system with the impurity adding function according to any one of claims 1-5, characterized in that, The method comprises the following steps: 1) Before the test, the liquid oxygen input pipeline (13) and the bypass liquid oxygen pipeline (8) are pre-cooled; 2) open the liquid oxygen main valve (2) to ensure the normal flow of liquid oxygen in the liquid oxygen main pipeline (1) and provide fuel for the oxygen-enriched gas combustion device (11) through the fuel supply module, so that the oxygen-enriched gas combustion device (11) works normally; 3) after the combustion state of the oxygen-enriched gas combustion device (11) to be tested is stable, open the bypass oxygen valve (6), and carry the impurities to be added in the impurity storage tube (4) into the oxygen-enriched gas combustion device (11) through the liquid oxygen pipeline (8), so as to realize the scouring of the turbine material test piece in the oxygen-enriched gas environment.

7. The method of impurity addition of claim 6, wherein, Step 3) is specifically: After the combustion state of the oxygen-enriched gas combustion device (11) to be tested is stable, open the bypass oxygen valve (6), and carry the impurities to be added in the impurity storage tube (4) into the oxygen-enriched gas combustion device (11) through the liquid oxygen pipeline (8), and control the rate of the impurities to be added into the oxygen-enriched gas combustion device (11) by adjusting the main pipeline throttling device (3) on the liquid oxygen main pipeline (1) and the bypass pipeline throttling device (7) on the bypass liquid oxygen pipeline (8), so as to realize the scouring of the turbine material test piece in the oxygen-enriched gas environment.

8. The method of impurity addition of claim 7, wherein, The specific method of controlling the rate of the impurities to be added into the oxygen-enriched gas combustion device (11) by adjusting the main pipeline throttling device (3) on the liquid oxygen main pipeline (1) and the bypass pipeline throttling device (7) on the bypass liquid oxygen pipeline (8) in step 3) is: A. The rate at which the impurities in the impurity storage tank (4) are added into the oxygen-enriched fuel gas combustion device (11) is calculated by the following formula v 4: ; In the formulae: Aeffis the effective flow area of the main throttle device (3); Aeff is the effective flow area of the bypass passage throttle device (7); Qtotal is the total flow rate of oxidizer in the experiment; Density of oxidizer for the test; to the flow area of the impurity storage tube (4); B. Rate according to step A v 4. Adjusting the effective flow area of the main throttle device (3) on the liquid oxygen main pipeline (1) and the bypass throttle device (7) on the bypass liquid oxygen pipeline (8) to realize the erosion of the turbine material test piece to be tested in the oxygen-rich gas environment.

9. The method of impurity addition of claim 7, wherein, Further comprising step 4): Close the bypass oxygen valve (6) first, and then close the liquid oxygen main valve (2) at the end of the test.

10. The method of impurity addition of claim 7, wherein Step 1) further comprises step 0) before: Deposit the impurities to be added in the impurity storage tube (4), and connect one end of the impurity storage tube (4) with the liquid oxygen main pipeline (1), and connect the other end with the bypass oxygen valve (6) through the bypass filter (5).

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